CN106371470B - Device and method for controlling dissolved oxygen content in corrosion evaluation test - Google Patents
Device and method for controlling dissolved oxygen content in corrosion evaluation test Download PDFInfo
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- CN106371470B CN106371470B CN201610720895.5A CN201610720895A CN106371470B CN 106371470 B CN106371470 B CN 106371470B CN 201610720895 A CN201610720895 A CN 201610720895A CN 106371470 B CN106371470 B CN 106371470B
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- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 title claims abstract description 187
- 239000001301 oxygen Substances 0.000 title claims abstract description 187
- 229910052760 oxygen Inorganic materials 0.000 title claims abstract description 187
- 238000012360 testing method Methods 0.000 title claims abstract description 110
- 238000005260 corrosion Methods 0.000 title claims abstract description 86
- 230000007797 corrosion Effects 0.000 title claims abstract description 86
- 238000000034 method Methods 0.000 title claims abstract description 55
- 238000011156 evaluation Methods 0.000 title claims abstract description 41
- 239000012085 test solution Substances 0.000 claims abstract description 136
- 239000007789 gas Substances 0.000 claims abstract description 99
- 239000000243 solution Substances 0.000 claims abstract description 98
- 238000010926 purge Methods 0.000 claims abstract description 71
- 238000003860 storage Methods 0.000 claims abstract description 66
- 238000012544 monitoring process Methods 0.000 claims abstract description 61
- 239000012530 fluid Substances 0.000 claims abstract description 51
- 238000012546 transfer Methods 0.000 claims abstract description 21
- 230000001276 controlling effect Effects 0.000 claims description 66
- 239000007788 liquid Substances 0.000 claims description 37
- 239000000523 sample Substances 0.000 claims description 30
- 239000000463 material Substances 0.000 claims description 26
- 238000007789 sealing Methods 0.000 claims description 25
- 238000004891 communication Methods 0.000 claims description 16
- 238000004088 simulation Methods 0.000 claims description 14
- 229910001220 stainless steel Inorganic materials 0.000 claims description 11
- 239000010935 stainless steel Substances 0.000 claims description 11
- 238000005192 partition Methods 0.000 claims description 10
- -1 polytetrafluoroethylene Polymers 0.000 claims description 6
- 239000004810 polytetrafluoroethylene Substances 0.000 claims description 6
- 229920001343 polytetrafluoroethylene Polymers 0.000 claims description 6
- 238000011282 treatment Methods 0.000 claims description 6
- 238000000746 purification Methods 0.000 claims description 5
- 239000011261 inert gas Substances 0.000 claims description 4
- 239000000126 substance Substances 0.000 claims description 4
- 230000000295 complement effect Effects 0.000 claims description 3
- 230000001105 regulatory effect Effects 0.000 claims description 3
- 230000002000 scavenging effect Effects 0.000 claims description 3
- 238000005259 measurement Methods 0.000 description 6
- 229910045601 alloy Inorganic materials 0.000 description 3
- 239000000956 alloy Substances 0.000 description 3
- 238000011109 contamination Methods 0.000 description 3
- 230000013011 mating Effects 0.000 description 3
- 229910000831 Steel Inorganic materials 0.000 description 2
- 238000005336 cracking Methods 0.000 description 2
- 238000001514 detection method Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000009434 installation Methods 0.000 description 2
- 238000002955 isolation Methods 0.000 description 2
- 239000012528 membrane Substances 0.000 description 2
- 230000035945 sensitivity Effects 0.000 description 2
- 239000010959 steel Substances 0.000 description 2
- 238000003466 welding Methods 0.000 description 2
- 239000010963 304 stainless steel Substances 0.000 description 1
- 229910000619 316 stainless steel Inorganic materials 0.000 description 1
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 description 1
- 229910000589 SAE 304 stainless steel Inorganic materials 0.000 description 1
- UCKMPCXJQFINFW-UHFFFAOYSA-N Sulphide Chemical compound [S-2] UCKMPCXJQFINFW-UHFFFAOYSA-N 0.000 description 1
- 230000003635 deoxygenating effect Effects 0.000 description 1
- 238000006392 deoxygenation reaction Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 239000001257 hydrogen Substances 0.000 description 1
- 229910052739 hydrogen Inorganic materials 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 230000002195 synergetic effect Effects 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
Classifications
-
- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05D—SYSTEMS FOR CONTROLLING OR REGULATING NON-ELECTRIC VARIABLES
- G05D11/00—Control of flow ratio
Abstract
The invention discloses a device and a method for controlling the content of dissolved oxygen in a corrosion evaluation test. Wherein the device for controlling the content of dissolved oxygen in the corrosion evaluation test comprises a solution container in which a test solution to be purified is stored; a dissolved oxygen monitoring unit for monitoring the dissolved oxygen content in the test solution in the solution container; a fluid flow control unit for controlling the flow of fluid in the device. The fluid flow control unit controls the on-off and flow rate of the purge gas from the purge gas unit, thereby purging the test solution in the solution container. The fluid flow control unit further controls the transfer of the treated test solution from the solution container to the solution storage unit. According to the device and the method, through the action of the fluid flow control unit, the flowing medium in the connecting conduit is controlled, the solution is purified and transferred, the test solution is ensured to reach the specified dissolved oxygen content, and no secondary pollution is generated.
Description
Technical Field
The invention relates to a device for controlling the content of dissolved oxygen in a corrosion evaluation test, and also relates to a method for controlling the content of dissolved oxygen in the corrosion evaluation test, belonging to the field of corrosion resistance evaluation of materials.
Background
Oxygen is a common and important substance in nature, and the concentration of oxygen in water is about 9ppmw at normal temperature and pressure, with a proportion of about 20% in air. However, many materials are in service in environments with very low or even no dissolved oxygen.
In the service environment of part of materials, the increase of the content of dissolved oxygen has a great influence on corrosion. Thus, in evaluating the corrosiveness of materials, it is necessary to strictly control the dissolved oxygen content in the test environment to reduce the uncertainty caused by the presence of oxygen. Along with the improvement of the requirements of the material performance at home and abroad, the corrosion resistance is one of the important performances of the material, so the accuracy and the reliability of the corrosion test become particularly important. The strict control of the dissolved oxygen content of the test environment is an important part of highly accurate corrosion tests.
Many materials are rated for corrosion resistance and define the dissolved oxygen content conditions of the relevant test, such as those specified in European federal standards for corrosion (European Federal of Corrosion Publication, EFC) in Sulfide Stress Corrosion (SSC) and Stress Corrosion Cracking (SCC) rated tests, where the concentration of dissolved oxygen is less than 10ppbw. In addition, in ANSINACE TM0177 2016, solutions for testing low alloy steels with strength below 552MPa are specified, the experimental solutions require less than 50ppbw of dissolved oxygen; for testing low alloy steels and corrosion resistant alloys with strength higher than 552MPa, the experimental solution needs less than 10ppbw of dissolved oxygen; in the ANSINACE TM0284-2016 standard, it is defined that solutions using certain Hydrogen Induced Cracking (HIC) experiments have an oxygen content below 50ppbw.
Therefore, there is a need for an apparatus and method for controlling the dissolved oxygen content of a corrosion-evaluating test, which can monitor the dissolved oxygen content in a corrosive environment in real time and control the dissolved oxygen content by its own functions.
Disclosure of Invention
The invention aims to provide a device for controlling the dissolved oxygen content of a corrosion evaluation test, which can control the dissolved oxygen content of a corrosion evaluation test system.
The apparatus for controlling the content of dissolved oxygen in a corrosion-evaluating test according to the present invention comprises a solution container in which a test solution to be purified is stored; a dissolved oxygen monitoring unit for monitoring the dissolved oxygen content of the test solution in the solution container; a fluid flow control unit for controlling the flow of fluid in the device. The solution container is connected to and in fluid communication with the dissolved oxygen monitoring unit and the fluid flow control unit. The fluid flow control unit is further connected to and in fluid communication with the purge gas unit and the solution storage unit. The fluid flow control unit controls the on-off and flow rate of the purge gas from the purge gas unit, thereby purging the test solution in the solution container. The fluid flow control unit further controls the flow direction and function of the purge gas to transfer the treated test solution to the solution storage unit.
According to the apparatus for controlling the content of dissolved oxygen in the corrosion evaluation test of the present invention, optionally, the solution container further comprises a container body having a flange portion and a kettle body; and a container cover covering the container body. The lower surface of the flange portion of the container body and the upper surface of the container cover have complementary shapes, and at least one of the flange portion of the container body and the container cover is formed with a groove in which an O-ring can be received, so that the O-ring and a screw cap for fastening compress and seal the container body and the container cover.
According to the apparatus for controlling the content of dissolved oxygen in the corrosion-evaluating test of the present invention, optionally, the purge gas unit further comprises a flow meter and a purge gas source. The fluid flow control unit further includes a control panel and a valve train. The valve train includes a first valve having at least a first inlet, a first outlet, and a second outlet; a second valve having at least a first inlet and a first outlet; a third valve having at least a first inlet, a second inlet, and a first outlet; and a fourth valve having at least a first inlet, a first outlet, and a second outlet. The solution storage unit includes a first storage unit and a second storage unit. The first inlet of the first valve is connected to the purge gas source via the flow meter. The first and second outlets of the fourth valve are connected to the first and second storage units, respectively.
According to the apparatus for controlling the content of dissolved oxygen in the corrosion evaluation test of the present invention, optionally, the container body includes a liquid portion when the test solution is contained, and a gas portion above the liquid portion. The first outlet of the first valve is connected to a first long conduit which further extends into the liquid portion for introducing a purge gas into the test solution. The first outlet of the second valve is connected to a first short conduit extending further into the gas portion than into the liquid portion for regulating the gas pressure within the container body. The second inlet of the third valve is connected to a second long conduit which extends further into the liquid portion for transferring the treated test solution.
According to the device for controlling the content of dissolved oxygen in corrosion evaluation tests of the present invention, optionally, the first inlet of the first valve is connected and sealed with the interface of the flowmeter using NPT threads and double-bayonet.
According to the device for controlling the content of dissolved oxygen in a corrosion evaluation test of the present invention, optionally, the first valve is switchable between at least a first position and a second position, the second valve is switchable to at least a first position which is normally open, the third valve is switchable between at least a first position and a second position, and the fourth valve is switchable between at least a first position, a second position and a third position. When the first valve is switched to the second position, the second valve is switched to the first position, the third valve is switched to the first position, and the fourth valve is switched to the first position, purge gas from the purge gas unit can be introduced into the liquid portion of the container body through the first long conduit to be mixed with a test solution for a purge treatment.
According to the apparatus for controlling the content of dissolved oxygen in the corrosion evaluation test of the present invention, optionally, when the first valve is switched to the first position, the second valve is switched to the first position, the third valve is switched to the second position, and the fourth valve is switched to the first position, the treated test solution in the liquid portion of the container body can be transferred to the first storage unit through the first outlet of the fourth valve.
According to the apparatus for controlling the content of dissolved oxygen in the corrosion evaluation test of the present invention, optionally, when the first valve is switched to the first position, the second valve is switched to the first position, the third valve is switched to the second position, and the fourth valve is switched to the second position, the treated test solution in the liquid portion of the container body can be transferred to the second storage unit through the second outlet of the fourth valve.
According to the device for controlling the content of the dissolved oxygen in the corrosion evaluation test of the present invention, optionally, the first storage unit stores therein a test solution for physical and chemical property test, and/or the second storage unit stores therein a test solution for subsequent corrosion simulation test, or the second storage unit is a unit for performing subsequent corrosion simulation test.
The apparatus for controlling the content of dissolved oxygen in a corrosion-evaluating test according to the present invention, optionally, further comprises: the pressure control unit comprises a pressure safety valve and a mechanical pressure gauge, and the container cover is further provided with a threading threaded hole, wherein the pressure safety valve is in fluid communication with the mechanical pressure gauge, the pressure safety valve and the mechanical pressure gauge are integrally connected through a stainless steel conduit and a tee joint, are connected with the container cover through a conduit and a partition threading joint, are in fluid communication with the container body, so that the gas pressure in the container body is monitored and controlled, the pressure safety valve, the mechanical pressure gauge, the tee joint, the partition threading joint and the stainless steel conduit are connected through double clamping sleeves and are sealed, and the partition threading joint and the container cover are sealed through NPT threads.
The apparatus for controlling the content of dissolved oxygen in corrosion-evaluating tests according to the present invention, optionally, further comprises a liquid level monitoring unit including at least a solution level gauge. The kettle body of the container main body is further processed with a liquid level meter hole. The solution level gauge is mounted through the gauge aperture and O-ring sealed to the container body to monitor the volume of test solution within the container body.
According to the apparatus for controlling the content of dissolved oxygen in the corrosion evaluation test of the present invention, optionally, the dissolved oxygen monitoring unit includes a dissolved oxygen monitoring probe and a dissolved oxygen tester. The kettle body of the container main body is further processed with a probe hole. During assembly, the dissolved oxygen monitoring probe extends through the probe aperture to directly contact the test solution within the container body to monitor the dissolved oxygen content of the test solution. The dissolved oxygen monitoring probe and the container body are sealed by an O-ring.
According to the apparatus for controlling the dissolved oxygen content in the corrosion-evaluating test of the present invention, optionally, the purge gas source is an oxygen-scavenging gas source, and the purge gas is an inert gas or a test gas having an oxygen content that meets the oxygen-scavenging requirement, for treating the dissolved oxygen content in the test solution to below a threshold value.
According to the apparatus for controlling the content of dissolved oxygen in the corrosion evaluation test of the present invention, the container body and the container cover are optionally made of stainless steel material or polytetrafluoroethylene material.
According to the apparatus for controlling dissolved oxygen content in corrosion evaluation test of the present invention, optionally, the first long conduit is sealed with the container body and the container cover using NPT screw and double-bayonet joint, the first short conduit is sealed with the container body and the container cover using NPT screw or RT screw joint, and the second long conduit is sealed with the container body and the container cover using NPT screw and double-bayonet joint.
It is another object of the present invention to provide a method for controlling the dissolved oxygen content of a corrosion evaluation test that allows for the control of the dissolved oxygen content of a corrosion evaluation test system.
A method of controlling dissolved oxygen content of a corrosion evaluator test according to the present invention, said method comprising the steps of: loading a test solution; introducing a purge gas into the test solution and monitoring the dissolved oxygen content of the test solution; after the monitored dissolved oxygen content is below the dissolved oxygen content threshold, the treated test solution is transferred by passing a purge gas.
The method of controlling dissolved oxygen content of corrosion evaluation test according to the present invention, optionally, further comprises: in the step of introducing the purified gas, controlling the switch and the flow of the purified gas; in the step of transferring the treated test solution, the switching and transferring paths of the treated test solution are controlled.
The method of controlling dissolved oxygen content of corrosion evaluation test according to the present invention, optionally, further comprises: in the step of transferring the treated test solution, the internal pressure of the system is controlled so that the internal fluid flows in a predetermined direction and the operating pressure is less than the pressure threshold.
The method of controlling dissolved oxygen content of corrosion evaluation test according to the present invention, optionally, further comprises: in the test solution transferring step, the volume of the test solution is monitored, and when the volume of the test solution to be transferred reaches the transfer solution amount, the transfer of the test solution is stopped.
According to the method for controlling the dissolved oxygen content of the corrosion-evaluating test of the present invention, the purge gas is optionally an inert gas or a test gas having an oxygen content that meets the oxygen removal requirement.
According to the method of controlling the dissolved oxygen content of the corrosion-evaluating test of the present invention, the container for holding the test solution is optionally made of a stainless steel material or a polytetrafluoroethylene material.
The device and the method for controlling the dissolved oxygen content of the corrosion evaluation test can monitor the liquid level of the test solution and the dissolved oxygen content in the test solution in real time, and realize the purification of the test solution by the synergistic effect of the valve group in the fluid flow control unit, and accurately and stably control the dissolved oxygen content in the test solution by means of the reliable sealing connection of each link. Further, according to the apparatus and method for controlling the dissolved oxygen content of the corrosion-evaluating test of the present invention, it is still possible to transfer the treated (e.g., deoxidized) solution to a subsequent test solution physicochemical property testing apparatus or corrosion simulation testing apparatus with isolation of contamination of an external oxygen-containing medium or the like by means of reliable sealing between components and cooperation of the valve group in the fluid flow control unit.
Further, the device and the method for controlling the content of the dissolved oxygen for corrosion evaluation test according to the invention adopt materials with certain pressure resistance and corrosion resistance, so that the device and the method can cope with more dissolved oxygen purification treatment of test solutions. The invention comprises safety measures for solving the problem of accident caused by test operation errors. The device for controlling the content of the dissolved oxygen in the corrosion evaluation test has the advantages of strong practicability, high safety, good detection sensitivity, convenient observation, convenient test and installation and high cost performance.
Drawings
In order to more clearly illustrate the technical solution of the present invention, the drawings required in the description of the present invention will be briefly described below. It is evident that the drawings in the following description are only some embodiments of the present invention and that other drawings may be obtained from these drawings without inventive effort for a person of ordinary skill in the art.
Fig. 1 is a schematic diagram of an apparatus for corrosion evaluation test dissolved oxygen content control according to the present invention, in which a solution container 1, a dissolved oxygen monitoring unit 2, a fluid flow control unit 3, and a purge gas unit 4 are exemplarily shown.
Fig. 2 is a schematic view of the fluid flow control unit 3 in the apparatus for corrosion evaluation test dissolved oxygen content control according to the present invention, in which the connection manner, switchable positions, etc. of the valve group 31 in the fluid flow control unit 3 are exemplarily shown.
Reference numerals
1. Solution container
2. Dissolved oxygen monitoring unit
3. Fluid flow control unit
4. Gas purifying unit
5. Solution storage unit
11. Pressure control unit
111. Pressure safety valve
112. Mechanical pressure gauge
12. Liquid level monitoring unit
121. Solution level gauge
122. Probe hole
123. Threading threaded hole
124. Liquid level meter hole
30. Control panel
31. Valve group
101. Container body
102. Container cover
131. First long catheter
132. First short conduit
133. Second long catheter
141 O-shaped sealing ring
151. Bolt and nut
161. A first hole
162. Second hole
163. Third hole
201. Dissolved oxygen monitoring probe
202. Dissolved oxygen tester
311. First valve
3111. A first inlet
3112. A first outlet
3113. A second outlet
311a first position
311b second position
312. Second valve
3121. A first inlet
3122. A first outlet
312a normally open position
313. Third valve
3132. A first inlet
3133. A second inlet
3131. A first outlet
313a first position
313b second position
314. Fourth valve
3141. A first inlet
3142. A first outlet
3143. A second outlet
314a first position
314b second position
314c third position
401. Flowmeter for measuring flow rate
402. Purified gas source
501. First storage unit
502. Second storage unit
1011. Flange part
1012. Kettle body
S G Gas portion
S L Liquid portion
L 1 Predetermined amount of liquid to be injected
L 2 Transfer solution amount
L 3 Transfer solution amount
DO T Threshold value of dissolved oxygen content
P T Pressure threshold
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention more clear, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. It will be apparent that the described embodiments are some, but not all, embodiments of the invention. All other embodiments, which can be made by a person skilled in the art without creative efforts, based on the described embodiments of the present invention fall within the protection scope of the present invention.
Unless defined otherwise, technical or scientific terms used herein should be given the ordinary meaning as understood by one of ordinary skill in the art to which this invention belongs. The terms "first," "second," and the like in the description and in the claims, are not used for any order, quantity, or importance, but are used for distinguishing between different elements. Likewise, the terms "a" or "an" and the like do not denote a limitation of quantity, but rather denote the presence of at least one.
The apparatus for controlling the dissolved oxygen content for corrosion evaluation test according to the present invention includes a solution container 1. Referring to fig. 1, the solution container 1 includes at least a container body 101 and a container lid 102. In an embodiment, the container body 101 has a flange portion 1011 extending in a protruding manner outwardly from an upper surface thereof. Preferably, referring to fig. 1, the upper surface of the flange portion 1011 of the container body 101 is substantially planar, and the lower surface of the container cover 102 is also substantially planar. Alternatively, the upper surface of the flange portion 1011 of the container body 101 may also have a complementary surface shape to the lower surface of the container cover 102. As an example, a threaded through hole is formed in the flange portion 1011 of the container body 101, and a mating threaded through hole of the same size is also formed in a corresponding position on the container cover 102. During assembly, referring to fig. 1, the container cover 102 may be covered and fastened to the container body 101 by means of the above-mentioned mutually-fitted threaded through-holes and the screw nuts 151. Further, in terms of sealing, at least one of the flange portion 1011 of the container body 101 and the container cover 102 is provided with a groove (not shown) for accommodating, for example, an O-ring 141 having a mating dimension, thereby reliably sealing the connection between the container body 101 and the container cover 102 by tightening the above-mentioned screw cap 151. This ensures sealing engagement between the container body 101 and the container lid 102, and thus the test solution and the test environment are not affected by the external oxygen-containing medium leaking in due to poor sealing.
Although in the embodiment an O-ring 141 and a screw cap 151 are used to seal the mating gap between the container body 101 and the container lid 102, it should be understood that the invention is not so limited. It should also be noted that in embodiments, since the solution container 102 is inevitably exposed to purge gas and test solution during operation, the materials used to make the solution container 102 need to have certain pressure and corrosion resistance properties, and the choice of materials will be described in detail below.
In an embodiment, for example, referring to fig. 1, the solution container 1 is provided with a pressure control unit 11 and a liquid level monitoring unit 12, which respectively implement pressure control and liquid level monitoring of the solution in the solution container 1.
In an embodiment, for example with reference to fig. 1, the pressure control unit 11 comprises at least a pressure relief valve 111 and a mechanical pressure gauge 112, so as to achieve pressure control within the solution container 1, ensuring that the pressure is within a reasonable and safe range. The pressure relief valve 111, the mechanical pressure gauge 112 and the container cover 102 are connected by means of screw holes, partition joints and connecting pipes, so that a passage between the pressure relief valve 111, the mechanical pressure gauge 112 and the container cover 102 is realized, and sealing is realized by means of double-clamping joints. Specifically, the double ferrule fitting inserts the catheter into the ferrule, locks with the ferrule nut, abuts the ferrule, and cuts into the tube to seal. The double ferrule fitting eliminates the need for a permanent connection process (e.g., welding) when connecting to the connecting conduit, thereby achieving a reliable seal between the pressure relief valve 111, the mechanical pressure gauge 112, and the container cover 102 while avoiding potential risks that may be associated with inadvertent welding.
The pressure safety valve 111 and the mechanical pressure gauge 112 are integrally connected with the container cover 102 by using a stainless steel conduit and a tee joint, are connected with the container body 101 by using a conduit and a partition wall threading joint, and are in fluid communication with the container body 101, so that the gas pressure in the container body 101 is monitored and controlled, and the pressure safety valve 111, the mechanical pressure gauge 112, the tee joint, the partition wall threading joint and the stainless steel conduit are connected by using double clamping sleeves and are sealed, and the partition wall threading joint and the container cover are sealed by using NPT threads.
In an embodiment, referring to fig. 1 for example, the level monitoring unit 12 comprises at least a solution level meter 121, thereby enabling level monitoring of the solution in the solution container 1. The solution level gauge 121 may be a tuning fork vibration type level gauge, a magnetic float type level gauge, a pressure type level gauge, or the like. Preferably, the tank body of the container main body 101 is processed with a solution level gauge hole 124, and the solution level gauge 121 is attached to the tank body of the solution container 1 through the solution level gauge hole 124. Specifically, the solution level gauge 121 is threadably connected to the solution level gauge bore 124 and sealed while the solution level gauge 121 is in fluid communication with the test solution within the container body 101. By the above connection and sealing means, the solution level gauge 121 can realize real-time display and monitoring of the amount of solution in the container body 101 with ensuring sealing.
The apparatus for controlling the content of dissolved oxygen for corrosion evaluation test according to the present invention further comprises a dissolved oxygen monitoring unit 2. The dissolved oxygen monitoring unit 2 includes at least a dissolved oxygen monitoring probe 201 and a dissolved oxygen tester 202. The dissolved oxygen monitoring probe 201 and the dissolved oxygen meter 202 are electrically connected to realize the communication of measurement data. In an embodiment, the tank body lower portion of the container main body 101 is provided with a probe hole 122. In assembly, the dissolved oxygen monitoring probe 201 extends through the probe aperture 122, into the interior of the container body 101, directly contacts the test solution, and is in fluid communication with the test solution. Thereby, the dissolved oxygen monitoring unit 2 can realize real-time monitoring of the dissolved oxygen content in the test solution in the container body 101 by the dissolved oxygen monitoring probe 201, and display the measurement result of the dissolved oxygen content on the display device (not shown) of the dissolved oxygen tester 202. Preferably, the tank provided with probe holes 122 is different from the tank provided with solution level gauge holes 124. In other words, in the assembled state, the dissolved oxygen monitoring probe 201 and the solution level gauge 121 are respectively connected to different tanks of the container main body 101 or respectively connected to different positions of the tank of the container main body 101. One advantage of this arrangement is that the level measurement and the dissolved oxygen content measurement of the test solution can be performed independently of each other; yet another advantage is that since the probe aperture 122 and the solution level gauge aperture 124 are spaced apart, the strength and pressure resistance of the container body 101 are not significantly affected.
Preferably, the dissolved oxygen monitoring unit 2 needs to have a monitoring capability that meets the test conditions. Specifically, the dissolved oxygen measurement range of the dissolved oxygen monitoring unit 2 is not less than 5ppb. Further, when the dissolved oxygen content is less than 100ppb, the measurement accuracy of the dissolved oxygen monitoring unit 2 is not less than 1ppb. It is further preferred that the dissolved oxygen monitoring probe 201 is threadably connected to the solution oxygen monitoring probe hole 122 on the container body 101 and sealing is achieved using an O-ring. The connection and sealing mode has the advantage of not causing secondary pollution of the test solution in the process of measuring the dissolved oxygen content. Furthermore, in order to ensure the accuracy of the dissolved oxygen content monitoring, the dissolved oxygen monitoring unit 2 needs to be calibrated or calibrated before the official test.
While in the embodiment a threaded connection and O-ring seal are used to ensure a reliable seal between the dissolved oxygen monitoring probe 201 and the solution oxygen monitoring probe bore 122 on the container body 101, it should be understood that the invention is not so limited. It should also be noted that in embodiments, since the dissolved oxygen monitoring probe 201 needs to be in direct contact with the test solution, the material of the dissolved oxygen monitoring probe 201 needs to have a considerable corrosion resistance. Preferably, the permeable membrane in the probe is a corrosion resistant permselective membrane (e.g., polytetrafluoroethylene).
The apparatus for controlling the content of dissolved oxygen for corrosion evaluation test according to the present invention further comprises a fluid flow control unit 3. The fluid flow control unit 3 comprises a control panel 30, the control panel 30 being provided with a valve group 31. The valve group 31 includes at least four valves, namely a first valve 311, a second valve 312, a third valve 313 and a fourth valve 314. The manner in which the valves are connected and sealed, as well as the functions that can be achieved, etc. will be described in detail below.
In an embodiment, the first valve 311 is connected to the purge gas unit 4. Alternatively, the purge gas unit 4 may be provided inside the apparatus for corrosion-evaluating test dissolved oxygen content control, or may be provided outside the apparatus for corrosion-evaluating test dissolved oxygen content control. The purge gas unit 4 comprises at least a flow meter 401 and a purge gas source 402. Specifically, the first inlet 3111 of the first valve 311 is connected to a flow meter 401 via a conduit, the flow meter 401 being further in fluid communication with a purge gas source 402. In terms of sealing, as an example, the connection and sealing between the first inlet 3111 and the corresponding interface of the flow meter 401 may be made using 60 degree cone threads (i.e., NPT) or RT threads and double ferrules. In operation, the flow meter 401 is capable of controlling the flow of purge gas delivered by the purge gas source 402 to the first inlet 3111 of the first valve 311.
In an embodiment, the first valve 311 is further in fluid communication with the interior of the container body 101. Specifically, the first outlet 3112 of the first valve 311 is connected to the first long conduit 131; during assembly, the first long conduit 131 extends through the first aperture 161 provided in the container cover 102 until the first long conduit 131 is inserted into the test solution in direct contact with the test solution.
In an embodiment, the first valve 311 is capable of switching between at least a first position 311a and a second position 311b, thereby closing or opening the first valve 311. Alternatively, when the first valve 311 is switched to the first position 311a, the first inlet 3111 of the first valve 311 is closed; thus, purge gas from the purge gas source 402 cannot flow through the first valve 311 into the solution container 1. Still alternatively, when the first valve 311 is switched to the second position 311b, the first inlet 3111 of the first valve 311 is open; thus, after the flow rate of the purge gas from the purge gas source 402 is controlled by the flow meter 401, the purge gas can flow through the first valve 311 and can further flow into the test solution to be mixed therewith. By way of non-limiting example, the purge gas source 402 may be an oxygen-scavenging gas source, and the purge gas output may be an oxygen-scavenging gas, which is the process of scavenging oxygen from the test solution. As an example, an analytical deoxygenation process may be employed in which deoxygenated gas is thoroughly mixed with the test solution such that dissolved oxygen dissolved in the test solution is evolved into the deoxygenated gas, thereby achieving the effect of deoxygenating the test solution.
Referring to fig. 2, the first valve 311 may also have a second outlet 3113, the manner and function of which will be described in more detail below.
In an embodiment, the second valve 312 has at least a first inlet 3121 and a first outlet 3122. Second oneThe first inlet 3121 of the valve 312 is connected to the second outlet 3113 of the first valve 311 by a conduit. The first outlet 3122 of the second valve 312 is connected to the first short conduit 132. During assembly, the first short conduit 132 extends through a second aperture 162 provided in the container lid 102; preferably, the first short conduit 132 is not inserted into the test solution. Alternatively, the second valve 312 may be a normally open valve. That is, the second valve 312 has at least a normally open position 312a, and the second valve 312 is normally in the normally open position 312a. Thus, referring to fig. 2, in the above-described arrangement and connection of the components, after the flow control of the flow meter 401, the purge gas from the purge gas source 402 can flow into the second valve 312 via the second outlet 3123 of the first valve 311, and further flow into the gas portion S of the solution vessel 1 via the first short conduit 132 connected to the first outlet 3122 of the second valve 312 G Without being directly introduced into the liquid portion S of the solution container 1 L Is a kind of medium. By means of the connection between the above-mentioned valves, pipes, etc., the purge gas outputted from the first outlet 3122 of the second valve 312 can be used when the reading of the dissolved oxygen meter 202 of the dissolved oxygen monitoring unit 2 drops to the threshold value DO T Thereafter, transfer of the treated test solution is performed, as will be described in further detail below.
In an embodiment, the third valve 313 has at least a first inlet 3132, a second inlet 3133, and a first outlet 3131. The first inlet 3132 of the third valve 313 is connected to the second valve 312 and the second inlet 3133 of the third valve 313 is connected to the second long conduit 133. During assembly, the second long conduit 133 extends through the third aperture 163 provided in the container cover 102 until the second long conduit 133 is inserted into the test solution in direct contact with the test solution.
It will be appreciated that the relative adjectives "long", "short" used in describing the connecting conduits above are for the purpose of distinguishing between different connecting conduits only and are not intended to limit the absolute dimensions of the modified connecting conduits. For example, the first long conduit 131 is not necessarily longer in length than the first short conduit 132; instead, as an example, the first long conduit 131 may be shorter in absolute size than the first short conduit 132.
In an embodiment, the third valve 313 is switchable between at least a first position 313a and a second position 313b, thereby closing or opening the third valve 313. Optionally, when the third valve 313 is switched to the first position 313a, the second inlet 3133 of the third valve 313 is closed; thus, the test solution from within the solution container 1 cannot flow through the third valve 313 and into the subsequent device (see FIG. 2, which may be, for example, the fourth valve 314, as will be described in more detail below). Still alternatively, when the third valve 313 is switched to the second position 313b, both the second inlet 3133 and the first outlet 3131 of the third valve 313 are open; thus, when the reading of the dissolved oxygen meter 202 of the dissolved oxygen monitoring unit 2 falls to the threshold value DO T Thereafter, the test solution (which may be a treated test solution in general) from within the solution container 1 can flow through the third valve 313 and can further flow into a subsequent device (described in detail below).
Referring to fig. 2, and based on the above description, when the first valve 311 is switched to the first position 311a, the second valve 312 is normally open, and the third valve 313 is switched to the second position 313b, purge gas from the purge gas source 402 cannot enter the test solution through the first valve 311, but enters the gas portion S of the solution container 1 through the first short conduit 132 connected to the second valve 312 G Thereby causing the pressure in the solution container 1 to be gradually adjusted, when the indication of the dissolved oxygen meter 202 of the dissolved oxygen monitoring unit 2 falls to the threshold value DO T Thereafter, the test solution treated with the purge gas is transferred through the first outlet 3131 of the third valve 313.
In an embodiment, the fourth valve 314 has at least a first inlet 3141, a first outlet 3142, and a second outlet 3143. The first inlet 3141 of the fourth valve 314 is connected to the first outlet 3131 of the third valve 313 by a conduit. Optionally, the fourth valve 314 is connected to the solution storage unit 5, the solution storage unit 5 comprising at least a first storage unit 501 and a second storage unit 502. As an example, the first outlet 3142 of the fourth valve 314 may be connected to the first storage unit 501 and the second outlet 3143 of the fourth valve 314 may be connected to the second storage unit 502. In such a connection, the test solution transferred out through the first outlet 3131 of the third valve 313 may be output into the first and second storage units 501 and 502 through the first and second outlets 3142 and 3143 of the fourth valve 314, respectively.
In an embodiment, both the first storage unit 501 and the second storage unit 502 may store the test solution after the purge gas treatment. As a non-limiting example of application, the first storage unit 501 is, for example, a beaker, in which the stored test solution can be used, for example, for measuring physicochemical properties. Also by way of example, the second storage unit 502 stores, for example, a test solution for a subsequent corrosion simulation test, or the second storage unit 502 is a subsequent corrosion simulation test unit. In terms of sealing, as an example, the connection and sealing between the first outlet 3142 of the fourth valve 314 and the corresponding interface of the first storage unit 501 may be made using 60 degree cone threads (i.e., NPT) or RT threads and double ferrules; similarly, the connection and seal between the second outlet 3143 of the fourth valve 314 and the corresponding interface of the second reservoir unit 502 may also be made using 60 degree cone threads (i.e., NPT) or RT threads and double ferrules.
In an embodiment, the fourth valve 314 is capable of switching between at least a first position 314a, a second position 314b, and a third position 314c to control the transfer, storage, and testing process of the test solution. Optionally, when the fourth valve 314 is switched to the first position 314a, the first inlet 3141 of the fourth valve 314 is open, the first outlet 3142 is open, and the second outlet 3143 is closed; thus, the treated test solution from the first outlet 3131 of the third valve 313 flows through the first outlet 3142 of the fourth valve 314 into the first storage unit 501. In the non-limiting application example described above, the first storage unit 501 may be a beaker, in which the stored test solution may be used for measuring physicochemical properties, for example. Still alternatively, when the fourth valve 314 is switched to the second position 314b, the first inlet 3141 of the fourth valve 314 is open, the first outlet 3142 is closed, and the second outlet 3143 is open; thus, the treated test solution from the first outlet 3131 of the third valve 313 flows through the second outlet 3143 of the fourth valve 314 into the second storage unit 502. In the non-limiting example of application described above, the second storage unit 502 may be a subsequent corrosion simulation test device, wherein the stored test solution has a prescribed and stable dissolved oxygen content standard, which may be used for subsequent corrosion simulation tests and the like. Still alternatively, when the fourth valve 314 is switched to the third position 314c, the first inlet 3141 of the fourth valve 314 is closed, the first outlet 3142 is closed, and the second outlet 3143 is closed; thus, the treated test solution from the first outlet 3131 of the third valve 313 cannot flow through the fourth valve 314 into the storage unit. This closed configuration of the fourth valve 314 is suitable for determining by the solution level gauge 121 that a predetermined amount of the treated test solution has been transferred to the first storage unit 501 and/or the second storage unit 502.
It can be seen that the test solution treated by the apparatus for controlling dissolved oxygen content for corrosion evaluation test according to the present invention prevents secondary pollution of the test solution on the basis of ensuring a prescribed dissolved oxygen content by virtue of the above-described connection and sealing means, and thus the test solutions in the first storage unit 501 and the second storage unit 502 have dissolved oxygen contents that are standard-compliant and stable, thereby enabling to ensure the accuracy and reliability of the corrosion simulation test.
Preferably, the connection between any two of the first valve 311, the second valve 312, the third valve 313 and the fourth valve 314 in the valve group 31 inside the control panel 30 can be connected and sealed using 60 degree cone threads (i.e., NPT) or RT thread double ferrules. Further, according to the above description, the valves in the valve group 31 are functionally cooperated with each other to enable the introduction and the discharge of the purge gas and the test solution; and further, by means of a reliable sealing connection mode in each link of the whole device, the dissolved oxygen in the test solution is accurately controlled, and meanwhile, secondary pollution is not generated in the transfer process of the test solution.
In terms of material selection of the device, preferably, the components involved in each link are made of materials capable of meeting certain requirements of pressure resistance and corrosion resistance, as described in detail below. As an example, the fluid flow control unit 3 may be exposed to purge gas and test solutions during operation, so the materials used to fabricate the control panel 30 and the plurality of valves in the valve train 31 need to be sufficiently pressure and corrosion resistant. Also by way of example, in the apparatus for corrosion evaluation test dissolved oxygen content control according to the present invention, it is not difficult to find out from the above description that the connection pipes (e.g., the first long pipe 131, the first short pipe 132, and the second long pipe 132) are responsible for connecting the components of the respective links in the apparatus (e.g., the solution container 1, the dissolved oxygen monitoring unit 2, and the fluid flow control unit 3), and thus the materials for manufacturing the connection pipes also need to be sufficiently pressure-resistant, corrosion-resistant. As a non-limiting example, the above-mentioned material may be selected from stainless steel (for example, SUS 304 stainless steel, or SUS 316 stainless steel) or polytetrafluoroethylene, etc. having superior corrosion resistance, while considering the pressure resistance of the material.
Based on the above-described device structure and connection, fitting manner, and the like, as an exemplary embodiment, a method of controlling the dissolved oxygen content in a test solution using the device for corrosion evaluation test dissolved oxygen content control according to the present invention will be described in detail below. It should be understood that optional steps of the method are numbered below for ease of description, however such numbering should not be construed as limiting the invention in a logical order or the like.
For example only, in operation:
(a) The solution container 1 and the dissolved oxygen monitoring unit 2 are connected while ensuring the sealing of the joint of the probe hole 122 on the tank body of the container main body 101 and the dissolved oxygen monitoring probe 201. The power supply (not shown) of the dissolved oxygen monitoring unit 2 is turned on.
(b) The screw cap 151 is unscrewed, the container lid 102 is opened, and a test solution to be treated (for example, deoxygenated) is poured into the container body 101. The level of the test solution in the container body 101 is monitored by the solution level gauge 121 to reach the predetermined filling amount L 1 After that, pouring of the test solution is stopped and covered at the same timeThe container cover 102, the container cover 102 and the container body 101 are fastened using the screw cap 151, and the O-ring 141 is pressed to achieve a reliable seal between the container body 101 and the container cover 102.
(c) The solution container 1 is mechanically and electrically connected to the fluid flow control unit 3. A plurality of valves in the valve group 31 of the control panel 30 are connected and sealed.
An exemplary manner of connection is detailed below with reference to fig. 2.
(i) In the first valve 311, a first inlet 3111 is connected to the flow meter 401, a first outlet 3112 is connected to the first long conduit 131, and a second outlet 3113 is connected to a first inlet 3121 of the second valve 312.
(ii) In the second valve 312, the first inlet 3121 is connected to the second outlet 3113 of the first valve 311, and the first outlet 3122 is connected to the first short conduit 132.
(iii) In the third valve 313, the first inlet 3132 is connected to the second valve 312, the second inlet 3133 is connected to the second long conduit 133, and the first outlet 3131 is connected to the first inlet 3141 of the fourth valve 314.
(iv) In the fourth valve 314, the first inlet 3141 is connected to the first outlet 3131 of the third valve 313, the first outlet 3142 is connected to the first storage unit 501, and the second outlet 3143 is connected to the second storage unit 502.
In terms of sealing, preferably, the connection and sealing between the inlet and the outlet, or between the corresponding interfaces, can be ensured by means of NPT threads and double ferrules.
(d) The first long conduit 131 is extended through the first hole 161 on the container cover 102 and inserted into the liquid portion S L In which a first short conduit 132 is extended through a second hole 162 in the cover 102 and inserted into the gas part S G Is not inserted into the liquid portion S L In) and extends the second long conduit 133 through the third hole 163 in the container cover 102 and inserts into the liquid portion S L While ensuring a seal between the conduit and a corresponding aperture in the container cover 102.
(e) Assembling the pressure control unit 11, connecting the pressure relief valve 111 and the mechanical pressure gauge 112 to each other, and further passing through the threading screw hole 123 on the container cover 102 of the solution container 1 to be in fluid communication with the interior of the solution container 1 and to achieve sealing; assembling the purge gas unit 4, connecting the first inlet 3111 of the first valve 311 to the flow meter 401, further connecting the flow meter 401 to the purge gas source 402, and ensuring fluid communication and tightness therebetween; the first outlet 3142 and the second outlet 3143 of the fourth valve 314 are connected to the first storage unit 501 and the second storage unit 502, respectively, through pipes, and the sealability of the connection is ensured.
(f) After the connection is completed, the first valve 311 is switched to the second position 311b, the second valve 312 is kept open, the third valve 313 is switched to the first position 313a, and the fourth valve 314 is switched to the first position 314a; the purge gas source 402 is turned on, the flow meter 401 is adjusted to the appropriate purge gas (e.g., oxygen-scavenging gas) flow, and the purge gas is introduced into the solution container 101 through the first long conduit 131 connected to the first outlet 3112 of the first valve 311. Further, the dissolved oxygen meter 202 of the dissolved oxygen monitoring unit 2 will display the real-time dissolved oxygen content of the test solution.
(g) When the indication of the dissolved oxygen meter 202 of the dissolved oxygen monitoring unit 2 falls to the threshold value DO T Thereafter, a transfer operation of the treated test solution will be performed. As an example, the first valve 311 is switched to the first position 311a, the second valve 312 is kept normally open, the third valve 313 is switched to the second position 313b, and the fourth valve 314 is switched to the first position 314a. In this test solution transfer configuration of the valve set 31, the pressure within the container body 101 will be gradually adjusted for subsequent test solution transfers. It should be noted that the indication of the mechanical pressure gauge 112 should be controlled to be within a predetermined acceptable range.
(h) In the above described test solution transfer configuration of the valve set 31, the treated test solution will be transferred to the first storage unit 501 connected to the first outlet 3142 of the fourth valve 314. As described above, the first storage unit 501 may be a test vessel such as a beaker in which the stored test solution may be used to measure physical and chemical propertiesEnergy, etc. The amount of treated test solution that has been transferred into the first storage unit 501 is observed in real time by the solution level gauge 121, when a predetermined transfer solution amount L has been reached 2 Thereafter, the fourth valve 314 is switched to the third position 314c, the purge gas source 402 is turned off, and the tail pressure in the solution container 1 is released, while the liquid level indication of the solution level gauge 121 is recorded.
(i) Still in the above-described test solution transfer configuration of the valve set 31, further switching of the fourth valve 314 to the second position 314b, the treated test solution will be transferred to the second storage unit 502 connected to the second outlet 3143 of the fourth valve 314. As described above, the second storage unit 502 may store a test solution for a subsequent corrosion simulation test; alternatively, the second storage unit 502 is a subsequent corrosion simulation test unit in which the stored test solution has a stable dissolved oxygen content meeting a predetermined standard, and may be used for corrosion simulation tests and the like. The amount of treated test solution that has been transferred into the second storage unit 502 is still observed in real time by the solution level gauge 121, when the predetermined transfer solution amount L has been reached 3 Thereafter, the fourth valve 314 is switched to the third position 314c, the purge gas source 402 is turned off, and the tail pressure in the solution container 1 is released, while the liquid level indication of the solution level gauge 121 is recorded. It should be noted that, after transferring the treated test solution to the first storage unit 501 or the second storage unit 502, the fourth valve 314 is switched to the third position 314c, so that the reverse flow of the purge gas can be prevented, thereby avoiding reintroduction of contamination.
From the technical effect point of view, the device for controlling the dissolved oxygen content of the corrosion-evaluating test according to the present invention can monitor the liquid level of the test solution and the dissolved oxygen content in the test solution in real time, and achieve purification of the test solution by the cooperation of the valve groups in the fluid flow control unit 3, accurately and stably control the dissolved oxygen content in the test solution by means of reliable sealing connection of each link. Further, the apparatus for controlling the dissolved oxygen content of corrosion-evaluating tests according to the present invention can still realize transfer of the treated (e.g., deoxidized) solution to a subsequent test solution physicochemical property testing apparatus or corrosion simulation testing apparatus with isolation of contamination of an external oxygen-containing medium or the like by reliable sealing between components and cooperation of the valve group in the fluid flow control unit 3.
Further, the material used for the device for controlling the dissolved oxygen content in the corrosion evaluation test according to the present invention has a certain pressure resistance and corrosion resistance, so that it can cope with more dissolved oxygen purification treatments of the test solution. The invention comprises safety measures for solving the problem of accident caused by test operation errors. The device for controlling the content of the dissolved oxygen in the corrosion evaluation test has the advantages of strong practicability, high safety, good detection sensitivity, convenient observation, convenient test and installation and high cost performance.
The foregoing is merely exemplary embodiments of the present invention and is not intended to limit the scope of the invention, which is defined by the appended claims.
Claims (21)
1. A device for controlling the content of dissolved oxygen in corrosion evaluation test,
it is characterized in that the method comprises the steps of,
the device comprises:
a solution container (1) in which a test solution to be purified is stored, the solution container (1) further comprising a container body (101), the container body (101) including a liquid portion (S) when filled with the test solution L ) And in the liquid portion (S L ) An upper gas part (S G )；
A dissolved oxygen monitoring unit (2) for monitoring the dissolved oxygen content of the test solution in the solution container (1);
a fluid flow control unit (3) for controlling the flow of fluid in the device;
a liquid level monitoring unit (12), the liquid level monitoring unit (12) at least comprises a solution level meter (121),
the apparatus further comprises:
a first short conduit (132), said first short conduit (132) extending to said gas portion (S G ) Is not extended to the liquid portion (S L ) For regulating the gas pressure within the container body (101);
a second long conduit (133), said second long conduit (133) extending to said liquid portion (S) L ) For transferring the treated test solution,
the solution container (1) is connected to the dissolved oxygen monitoring unit (2) and the fluid flow control unit (3) and is in fluid communication with the dissolved oxygen monitoring unit (2) and the fluid flow control unit (3),
the fluid flow control unit (3) is further connected to a purge gas unit (4) and a solution storage unit (5) and is in fluid communication with the purge gas unit (4) and the solution storage unit (5),
wherein:
the fluid flow control unit (3) controls the on-off and flow rate of the purge gas from the purge gas unit (4) so as to purge the test solution in the solution container (1),
the fluid flow control unit (3) further controls the flow direction and function of the purge gas to transfer the treated test solution into the solution storage unit (5),
the fluid flow control unit (3) further comprises a control panel (30) and a valve set (31),
the valve group (31) comprises: a first valve (311), a second valve (312), a third valve (313) and a fourth valve (314),
wherein:
the first valve (311) is connected to the purge gas unit (4),
The fourth valve (314) is connected to the solution storage unit (5),
the first valve (311) being switchable at least between a first position (311 a) and a second position (311 b),
the second valve (312) is switchable to at least a normally open first position (312 a),
the third valve (313) being switchable at least between a first position (313 a) and a second position (313 b),
the fourth valve (314) is switchable between at least a first position (314 a), a second position (314 b) and a third position (314 c),
wherein:
when the first valve (311) is switched to the second position (311 b), the second valve (312) is switched to the first position (312 a), the third valve (313) is switched to the first position (313 a), and the fourth valve (314) is switched to the first position (314 a), purge gas from the purge gas unit (4) can be introduced into the test solution of the container body (101) through the first valve (311), thereby mixing with the test solution to perform a purge treatment;
when the first valve (311) is switched to the first position (311 a), the second valve (312) is switched to the first position (312 a), the third valve (313) is switched to the second position (313 b), and the fourth valve (314) is switched to the first position (314 a), the treated test solution in the container body (101) can be transferred into the solution storage unit (5) through the fourth valve (314);
When the first valve (311) is switched to the first position (311 a), the second valve (312) is switched to the first position (312 a), the third valve (313) is switched to the second position (313 b), and the fourth valve (314) is switched to the third position (314 c), both the inlet and the outlet of the fourth valve (314) are closed.
2. The apparatus for controlling the content of dissolved oxygen in a corrosion evaluating test according to claim 1,
it is characterized in that the method comprises the steps of,
the container main body (101) has a flange portion (1011) and a kettle body (1012);
the solution container (1) further comprises a container cover (102), the container cover (102) covers the container main body (101),
wherein:
the lower surface of the flange portion (1011) of the container body (101) and the upper surface of the container cover (102) have complementary shapes,
at least one of the flange portion (1011) of the container body (101) and the container cover (102) is processed with a groove, and an O-ring (141) can be accommodated in the groove, so that the O-ring (141) and a bolt and nut (151) for fastening compress and seal the container body (101) and the container cover (102).
3. The apparatus for controlling the content of dissolved oxygen in a corrosion evaluating test according to claim 2,
It is characterized in that the method comprises the steps of,
the purge gas unit (4) further comprises a flow meter (401) and a purge gas source (402), and,
the valve group (31) of the fluid flow control unit (3) comprises:
a first valve (311), the first valve (311) having at least a first inlet (3111), a first outlet (3112), and a second outlet (3113);
-a second valve (312), the second valve (312) having at least a first inlet (3121) and a first outlet (3122);
a third valve (313), the third valve (313) having at least a first inlet (3132), a second inlet (3133) and a first outlet (3131);
a fourth valve (314), the fourth valve (314) having at least a first inlet (3141), a first outlet (3142) and a second outlet (3143),
the solution storage unit (5) comprises a first storage unit (501) and a second storage unit (502),
wherein:
a first inlet (3111) of the first valve (311) is connected to the source of purge gas (402) via the flow meter (401),
the first outlet (3142) and the second outlet (3143) of the fourth valve (314) are connected to the first storage unit (501) and the second storage unit (502), respectively.
4. The apparatus for controlling the content of dissolved oxygen in a corrosion evaluating test according to claim 3,
It is characterized in that the method comprises the steps of,
the first outlet (3112) of the first valve (311) is connected to a first long conduit (131), the first long conduit (131) further extending to the liquid portion (S L ) Wherein the device is used for introducing a purifying gas into the test solution,
the first outlet (3122) of the second valve (312) is connected to a first short conduit (132), the first short conduit (132) further extending to the gas portion (S G ) Is not extended to the liquid portion (S L ) For regulating the gas pressure in the container body (101),
the second inlet (3133) of the third valve (313) is connected to a second long conduit (133), the second long conduit (133) further extending to the liquid part (S L ) For transferring the treated test solution.
5. The apparatus for controlling the content of dissolved oxygen in a corrosion evaluating test according to claim 3,
it is characterized in that the method comprises the steps of,
the first inlet (3111) of the first valve (311) is connected and sealed to the interface of the flow meter (401) using NPT threads and double-clamping.
6. The apparatus for controlling the content of dissolved oxygen in a corrosion-evaluating test according to claim 4,
it is characterized in that the method comprises the steps of,
when the first valve (311) is switched to the second position (311 b), the second valve (312) is switched to the first position (312 a), the third valve (313) is switched to the first position (313 a), and the fourth valve (314) is switched to the first position (314 a), purge gas from the purge gas unit (4) can be introduced into the liquid portion (S) of the container body (101) through the first long conduit (131) L ) And then mixed with the test solution to carry out the purification treatment.
7. The apparatus for controlling the content of dissolved oxygen in a corrosion evaluating test according to claim 6,
it is characterized in that the method comprises the steps of,
when the first valve (311) is switched to the first position (311 a), the second valve (312) is switched to the first position (312 a), the third valve (313) is switched to the second position (313 b), and the fourth valve (314) is switched to the first position (314 a), the liquid portion (S L ) Can be transferred into the first storage unit (501) through a first outlet (3142) of the fourth valve (314).
8. The apparatus for controlling the content of dissolved oxygen in a corrosion evaluating test according to claim 6,
it is characterized in that the method comprises the steps of,
when the first valve (311) is switched to the first position (311 a), the second valve (312) is switched to the first position (312 a), the third valve (313) is switched to the second position (313 b), and the fourth valve (314) is switched to the second position (314 b), the liquid portion (S L ) Can be transferred into the second storage unit (502) through a second outlet (3143) of the fourth valve (314).
9. The apparatus for controlling the content of dissolved oxygen in a corrosion evaluation test according to any one of claims 3 to 8,
it is characterized in that the method comprises the steps of,
the first storage unit (501) stores therein a test solution for physical and chemical property testing, and/or
The second storage unit (502) stores therein a test solution for a subsequent corrosion simulation test, or
The second storage unit (502) is a unit for performing a subsequent corrosion simulation test.
10. The apparatus for controlling the content of dissolved oxygen in a corrosion-evaluating test according to claim 9,
it is characterized in that the method comprises the steps of,
the device further comprises:
a pressure control unit (11), the pressure control unit (11) comprising a pressure relief valve (111) and a mechanical pressure gauge (112), and,
the container cover (102) is further provided with a threading threaded hole (123),
wherein:
the pressure relief valve (111) and the mechanical pressure gauge (112) are in fluid communication, are integrally connected by a stainless steel conduit and a tee joint, are connected with the container cover (102) by a conduit and a partition wall through plate joint, are in fluid communication with the container main body (101), so as to monitor and control the gas pressure in the container main body (101),
The pressure safety valve (111), the mechanical pressure gauge (112), the tee joint, the partition wall threading connector and the stainless steel conduit are connected by using double clamping sleeves to realize sealing, and the partition wall threading connector and the container cover are sealed by using NPT threads.
11. The apparatus for controlling the content of dissolved oxygen in a corrosion-evaluating test according to claim 10,
it is characterized in that the method comprises the steps of,
the kettle body (1012) of the container main body (101) is further processed with a liquid level meter hole (124),
wherein:
the solution level gauge (121) is mounted and O-ring sealed to the container body (101) through the gauge aperture (124) to monitor the volume of test solution within the container body (101).
12. The apparatus for controlling the content of dissolved oxygen in a corrosion-evaluating test according to claim 11,
it is characterized in that the method comprises the steps of,
the dissolved oxygen monitoring unit (2) includes a dissolved oxygen monitoring probe (201) and a dissolved oxygen tester (202), and,
the kettle body (1012) of the container main body (101) is further processed with a probe hole (122),
wherein:
during assembly, the dissolved oxygen monitoring probe (201) extends through the probe aperture (122) to directly contact the test solution within the container body (101) to monitor the dissolved oxygen content of the test solution,
The dissolved oxygen monitoring probe (201) and the container body (101) are sealed by an O-ring.
13. The apparatus for controlling the content of dissolved oxygen in a corrosion-evaluating test according to claim 12,
it is characterized in that the method comprises the steps of,
the purge gas source (402) is an oxygen scavenging gas source, which is an inert gas or a test gas having an oxygen content that meets the oxygen scavenging requirement for treating the dissolved oxygen content of the test solution to below a threshold value (DO T )。
14. The apparatus for controlling the content of dissolved oxygen in a corrosion-evaluating test according to claim 13,
it is characterized in that the method comprises the steps of,
the container body (101) and the container cover (102) are made of stainless steel material or polytetrafluoroethylene material.
15. The apparatus for controlling the content of dissolved oxygen in a corrosion evaluation test according to claim 4 or 6,
it is characterized in that the method comprises the steps of,
the first long conduit (131) and the container body (101) and the container cover (102) are sealed by using NPT screw threads and a double-clamping sleeve joint,
the first short conduit (132) is sealed with the container body (101) and the container lid (102) using an NPT threaded or RT threaded joint,
the second long conduit (133) is sealed with the container body (101) and the container lid (102) using NPT threads and a double-bayonet joint.
16. A method for controlling the content of dissolved oxygen in corrosion evaluation test,
it is characterized in that the method comprises the steps of,
the method comprises the following steps:
loading a test solution;
introducing a purge gas into the test solution and monitoring the dissolved oxygen content of the test solution;
after the monitored dissolved oxygen content is below the dissolved oxygen content threshold, transferring the treated test solution by passing the purge gas,
wherein the method uses the device according to any one of claims 1 to 15.
17. The method for controlling the dissolved oxygen content in a corrosion evaluating test according to claim 16,
it is characterized in that the method comprises the steps of,
further comprises:
in the step of introducing the purified gas, controlling the switch and the flow of the purified gas;
in the step of transferring the treated test solution, the switching and transferring paths of the treated test solution are controlled.
18. The method for controlling the dissolved oxygen content in a corrosion evaluating test according to claim 16,
it is characterized in that the method comprises the steps of,
further comprises:
in the step of transferring the treated test solution, the internal pressure of the system is controlled so that the internal fluid flows in a predetermined direction and the operating pressure is less than the pressure threshold.
19. The method for controlling the dissolved oxygen content in a corrosion evaluating test according to claim 16,
it is characterized in that the method comprises the steps of,
further comprises:
in the test solution transferring step, the volume of the test solution is monitored, and when the volume of the transferred test solution reaches the transfer solution amount, the transfer of the test solution is stopped.
20. The method for controlling the dissolved oxygen content in a corrosion evaluating test according to claim 16,
it is characterized in that the method comprises the steps of,
the purified gas is inert gas or test gas with oxygen content reaching the requirement of deoxidization.
21. The method for controlling the dissolved oxygen content in a corrosion evaluating test according to claim 16,
it is characterized in that the method comprises the steps of,
the container for holding the test solution is made of stainless steel material or polytetrafluoroethylene material.
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| CN107381806A (en) * | 2017-09-07 | 2017-11-24 | 中南大学 | The water feed apparatus and method of a kind of anaerobic reactor |
| CN108896474B (en) * | 2018-08-01 | 2023-07-25 | 中国石油天然气集团有限公司 | Corrosion evaluation device and method for monitoring concentration of dissolved oxygen at high temperature in real time |
| CN108828160A (en) * | 2018-09-05 | 2018-11-16 | 安科工程技术研究院（北京）有限公司 | Test the portable unit of corrosive gas and dissolved oxygen in oil gas pipeline |
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